(19)

(11)

EP 0 935 783 A1

(12)

(43) Date of publication: 18.08.1999 Bulletin 1999/33 (21) Application number: 98925665.0 (22) Date of filing: 11.06.1998

(51) International Patent Classification (IPC):  G06F 17/ 30( . ) (86) International application number: PCT/FI1998/000501 (87) International publication number: WO 1998/059305 (30.12.1998 Gazette 1998/52)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB IE IT LI NL PT SE (30) Priority: 12.06.1997 FI 19970002499 (71) Applicant: NOKIA TELECOMMUNICATIONS OY 02150 Espoo (FI)	(72) Inventors: HEINO, Jukka FIN-33300 Tampere (FI) GRANBACKA, Jan-Erik FIN-33500 Tampere (FI) KOLPPO, Petteri FIN-33720 Tampere (FI) VALLI, Jyrki FIN-33580 Tampere (FI) (74) Representative: Holmström, Stefan Mikael, et al  Kolster Oy Ab, Iso Roobertinkatu 23, P.O. Box 148 00121 Helsinki 00121 Helsinki (FI)